Frequencies for first 10,000 rows of minute variable in accident dataset :

     minute |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        570        5.70        5.70
          1 |         92        0.92        6.62
          2 |        101        1.01        7.63
          3 |         96        0.96        8.59
          4 |        101        1.01        9.60
          5 |        323        3.23       12.83
          6 |         86        0.86       13.69
          7 |        118        1.18       14.87
          8 |        123        1.23       16.10
          9 |        100        1.00       17.10
         10 |        386        3.86       20.96
         11 |         91        0.91       21.87
         12 |        127        1.27       23.14
         13 |        116        1.16       24.30
         14 |        116        1.16       25.46
         15 |        398        3.98       29.44
         16 |        113        1.13       30.57
         17 |        120        1.20       31.77
         18 |        103        1.03       32.80
         19 |        104        1.04       33.84
         20 |        412        4.12       37.96
         21 |        113        1.13       39.09
         22 |         93        0.93       40.02
         23 |        124        1.24       41.26
         24 |        107        1.07       42.33
         25 |        350        3.50       45.83
         26 |         89        0.89       46.72
         27 |        100        1.00       47.72
         28 |        136        1.36       49.08
         29 |        104        1.04       50.12
         30 |        578        5.78       55.90
         31 |         84        0.84       56.74
         32 |         89        0.89       57.63
         33 |        108        1.08       58.71
         34 |        101        1.01       59.72
         35 |        306        3.06       62.78
         36 |         81        0.81       63.59
         37 |        122        1.22       64.81
         38 |        123        1.23       66.04
         39 |         96        0.96       67.00
         40 |        389        3.89       70.89
         41 |         83        0.83       71.72
         42 |        109        1.09       72.81
         43 |         98        0.98       73.79
         44 |         98        0.98       74.77
         45 |        428        4.28       79.05
         46 |        100        1.00       80.05
         47 |        102        1.02       81.07
         48 |        106        1.06       82.13
         49 |         81        0.81       82.94
         50 |        410        4.10       87.04
         51 |         97        0.97       88.01
         52 |        118        1.18       89.19
         53 |        106        1.06       90.25
         54 |         97        0.97       91.22
         55 |        321        3.21       94.43
         56 |         77        0.77       95.20
         57 |         98        0.98       96.18
         58 |        122        1.22       97.40
         59 |         99        0.99       98.39
         99 |        161        1.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016